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【简答题】
系统的因果性是指系统 只取决于n时刻以及n时刻以前的 ，而和 的输入序列无关。线性时不变系统具有因果性的充分必要条件是
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举一反三
【单选题】The use of transformer oil in a minimum-oil circuit breaker is ()
A.
to quench the arc and establish an insulated break between the contacts.
B.
to quench the arc and build insulation between the arc-quenching chamber and ground
C.
to establish an insulated break between the contacts and build insulation between the arc-quenching chamber and ground.
D.
to protect the circuit breaker from firing
【单选题】The wear of two metal suces can be reduced to minimum by use of ______.
A.
a suitable lubricant
B.
a proper coolant
C.
a sealing agent
D.
a hydraulic fluid
【单选题】She wore long, heavy dresses, clothes that allowed______movement.
A.
minimum of
B.
the minimum for
C.
her minimum of
D.
a minimum of
【单选题】By regulation，you MUST keep a record of the use of your radiotelephone for a minimum of（）.
A.
six months
B.
one year
C.
two years
D.
thirty months
【简答题】自然地理环境由 、 、 和 四个基本地圈组成。
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